Start by assembling all your ingredients. Make sure the spinach, pineapple, mango, and banana are frozen for that refreshing chill.
In your high-speed blender, add the frozen spinach, pineapple, mango, and banana first. This will help create a smooth blend.
Next, pour in your choice of milk. This will help everything mix together easily and create that creamy texture.
Add the vanilla extract and your preferred sweetener. Start with a small amount, and you can always add more later to suit your taste.
Blend on high until all ingredients are well combined and you achieve a smooth, creamy consistency. If the mixture is too thick, you can add a splash more milk.
Give your smoothie a taste. If it needs more sweetness, add a little more sweetener and blend again.
Pour your Tropical Green Smoothie into a glass or mason jar. If you're feeling fancy, you can garnish it with a slice of fruit or some chia seeds on top. Enjoy immediately for the best flavor and texture!